Preheat oven to 425 degrees Fahrenheit.
Line a baking sheet with parchment paper.
Prepare a lightly floured work area. Coat your pastry cutter in flour as well.
In a stand mixer, add the flour, salt, baking powder, and sugar. Combine using the whisk attachment.
Swap out the stand mixer attachment for the paddle one. Add the cubed butter, and mix until the dough forms tiny balls.
In a separate bowl, whisk the egg, vanilla, milk, and then add it to the stand mixer.
Combine over low-medium speed. The dough should come together and form a ball.
Remove bowl from the stand mixer and fold in the blueberries by hand.
Transfer dough to your floured work area.
Shape the dough into a 1″ thick circle. My circle was about 7 inches in diameter.
Using your pastry cutter, divide dough into 8 pieces. You can spread them out from the circle slightly so they do not stick to one another.
Bake for 12-14 mins or until golden brown edges form.